ABSTRACT
In previous chapters, consideration was given to those cycles that (by the proper placing of elements) could yield useful work from a heat source. By the simple expedient of rearranging the sequence of events in these cycles, it is possible (in principle) to remove heat from a region of lower temperature and to deliver it to a region of higher temperature by the input of mechanical work. This removal of heat by the use of mechanical energy has been called the refrigerating effect. In more general terms, refrigeration can be dened as the art of maintaining a body at temperatures below its surroundings or, alternatively, as the removal of heat from a place in which it is undesirable to a place in which it is not.
